Starline Brass takes pride in manufacturing the highest quality brass cases available. Their brass is made up of 70% copper and 30% zinc and is vertically drawn during the manufacturing process, resulting in more uniform wall thickness. To ensure consistent metallurgy across all lots, cases are annealed between draws. Each brass case is hand-inspected to ensure the highest possible quality. Starline Brass has been in business for over 30 years and is located in Sedalia, MO. You won't be disappointed if you choose Starline for your next reloads. Brass is brand new and unprimed. This is not a loaded round of ammunition. Before loading, bulk brass should be full-length sized, trimmed, and chamfered.